You might want to either up your dosage of metformin or change your medicine for diabetes. Watch what you eat with carbohydrates too. Before going to insulin I had a hard time lowering blood sugar and was extremely thirsty. When you can talk to your doctor.

How long have you been diagnosed? If newly diabetic it might take a little time to lower your sugar. But I would definitely call your doctor and ask. You might also want to change your diet. With more protein added and more substantial carbs. Metformin is really sensitive to amount of carbohydrates in your diet. Also there is nothing wrong with consulting your doctor. If this continues.

Have you found the cause of what appears to be your extreme thirst? That just might be a good place to start. Example, if your blood glucose is frequently high, thirst could be a consequence! On the other hand, if your doing alot of exercise, or physical work in hot humid weather, then dagger1234 has a good answer in her reply below.

One of the symptoms of uncontrolled diabetes is excessive thirst because your body tries to flush out the sugar in your bloodstream through urination. I would advise both drinking lots of water and getting/keeping your BG's as close to normal as possible. What was your last A1c?…can it be improved?

Your A1c reveals that your BG's are higher than they should be averaging around 255. This will definitely caused increased thirst. Get them down, and your thirst should also diminish…keep them at your current level, and you'll continue to be thirsty, no matter what you drink.

Try drinking room temperature water. Cold water is hard to consume a lot. I try to steer away from diet pop when I'm thirsty because I can never get enough of it. Or a nice cold glass of water with some Lemon, lime, strawberries in em. Mmmm